Pirrit Hills is an isolated group of peaks and nunatak

Nunatak

A nunatak is an exposed, often rocky element of a ridge, mountain, or peak not covered with ice or snow within an ice field or glacier. The term is typically used in areas where a permanent ice sheet is present...

s about 7 nautical miles (13 km) in extent, lying southward of the Ellsworth Mountains

Ellsworth Mountains

The Ellsworth Mountains are the highest mountain ranges in Antarctica, forming a long and wide chain of mountains in a north to south configuration on the western margin of the Ronne Ice Shelf. They are bisected by Minnesota Glacier to form the northern Sentinel Range and the southern Heritage...

, between the Heritage Range

Heritage Range

The Heritage Range is a major mountain range, long and wide, situated southward of Minnesota Glacier and forming the southern half of the Ellsworth Mountains in Antarctica...

 and Nash Hills

Nash Hills

Nash Hills is a short range of isolated ice-covered hills about 25 nautical miles northwest of Martin Hills. The feature was positioned by the U.S. Ellsworth-Byrd Traverse Party on December 10, 1958. Named by Advisory Committee on Antarctic Names for Lieutenant Archie R. Nash, U.S. Navy,...

. The feature was positioned by the U.S. Ellsworth-Byrd Traverse Party in December 1958. Named by Advisory Committee on Antarctic Names

Advisory Committee on Antarctic Names

The Advisory Committee on Antarctic Names is an advisory committee of the United States Board on Geographic Names responsible for recommending names for features in Antarctica...

 (US-ACAN) for John Pirrit, glaciologist with the traverse party who had wintered at Ellsworth Station

Ellsworth Station

The Ellsworth Station was an Antarctic base established by the United States during the 1957 International Geophysical Year. The base was soon handed over to Argentina and subsequently abandoned and covered with ice in 1962.-History:...

. Pirrit was scientific leader at Byrd Station

Byrd Station

Byrd Station refers to a research station established by the United States during the International Geophysical Year by the U.S. Navy during Operation Deep Freeze II in West Antarctica at 80°, 120°W...

in 1959.